package com.easypan.entity.dto;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;

public class CreateImageCode {
    // 图片的宽度。
    private int width = 160;
    // 图片的高度
    private int height = 40;
    // 验证码字符个数
    private int codeCount = 4;
    // 验证码干扰线数
    private int lineCount = 20;
    //验证码
    private String code = null;
    // 验证码图片Buffer
    private BufferedImage buffImg = null;
    Random random = new Random();

    public CreateImageCode() {
        creatImage();
    }

    public CreateImageCode(int width, int height) {
        this.width = width;
        this.height = height;
        creatImage();
    }

    public CreateImageCode(int width, int height, int codeCount) {
        this.width = width;
        this.height = height;
        this.codeCount = codeCount;
        creatImage();
    }

    public CreateImageCode(int width, int height, int codeCount, int lineCount) {
        this.width = width;
        this.height = height;
        this.codeCount = codeCount;
        this.lineCount = lineCount;
        creatImage();
    }

    //生成图片
    private void creatImage() {
        int fontWidth = width / codeCount;//字体的宽度
        int fontHeight = height - 6;//字体的高度
        int codeY = height - 8;

        //图像buffer
        buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics g = buffImg.getGraphics();
        //设置背景色
        g.setColor(getRandColor(200, 250));
        g.fillRect(0, 0, width, height);
        //设置字体
        Font font = new Font("Fixedsys", Font.BOLD, fontHeight);
        g.setFont(font);

        //设置干扰线
        for (int i = 0; i < lineCount; i++) {
            int xs = random.nextInt(width);
            int ys = random.nextInt(height);
            int xe = xs + random.nextInt(width);
            int ye = ys + random.nextInt(height);
            g.setColor(getRandColor(1, 255));
            g.drawLine(xs, ys, xe, ye);

        }

        //添加噪点
        float yawpRate = 0.01f;// 噪声率
        int area = (int) (yawpRate * width * height);
        for (int i = 0; i < area; i++) {
            int x = random.nextInt(width);
            int y = random.nextInt(height);
            buffImg.setRGB(x, y, random.nextInt(255));
        }
        String str1 = randomStr(codeCount);// 得到随机字符
        this.code = str1;
        for (int i = 0; i < codeCount; i++) {
            String strRand = str1.substring(i, i + 1);
            g.setColor(getRandColor(1, 255));
            // g.drawstring(a,x,y);
            // a为要画出来的东西，x和y表示要画的东西最左侧宇符的基线位于此图形上下文坐标系的 (x，y) 位置处
            g.drawString(strRand, i * fontWidth + 3, codeY);
        }
    }

    // 得到随机字符
    private String randomStr(int n) {
        String str1 = "ABCDEFGHIJKIMNOPORSTUVWXYZabcdefghijklmnopgrstuvwxyz1234567890";
        String str2 = "";
        int len = str1.length() - 1;
        double r;
        for (int i = 0; i < n; i++) {
            r = (Math.random()) * len;
            str2 = str2 + str1.charAt((int) r);
        }
        return str2;
    }

    // 得到随机颜色
    private Color getRandColor(int fc, int bc) {// 给定范围获得随机颜色
        if (fc > 255) fc = 255;
        if (bc > 255) bc = 255;
        int r = fc + random.nextInt(bc - fc);
        int g = fc + random.nextInt(bc - fc);
        int b = fc + random.nextInt(bc - fc);
        return new Color(r, g, b);
    }

    //产生随机字体
    private Font getFont(int size) {
        Random random = new Random();
        Font font[] = new Font[5];
        font[0] = new Font("Ravie", Font.PLAIN, size);
        font[1] = new Font("Antique olive Compact", Font.PLAIN, size);
        font[2] = new Font("eixedsys", Font.PLAIN, size);
        font[3] = new Font("wide Latin", Font.PLAIN, size);
        font[4] = new Font("Gill Sans ultra Bold", Font.PLAIN, size);
        return font[random.nextInt(5)];
    }
        // 扭曲方法
        private void shear (Graphics g,int wl, int h1, Color color) {
            shearX(g, wl, h1, color);
            shearY(g,wl, h1, color);
        }

    private void shearX (Graphics g,int wl, int hl, Color color){
        int period = random.nextInt(2);


        boolean borderGap = true;
        int frames=1;
        int phase = random.nextInt(2);
        for (int i = 0; i < hl; i++) {
            double d = (double) (period >> 1) * Math.sin((double) i / (double) period + (6.2831853071795862D * (double) phase) / (double)frames);
            g.copyArea(0, i,  wl, 1, (int) d,0);
            if (borderGap) {
                g.setColor(color);
                g.drawLine((int) d,i, 0, i);
                g.drawLine( (int) d + wl,i, wl, i);
            }
        }
    }

        private void shearY (Graphics g,int wl, int hl, Color color){
            int period = random.nextInt(40) + 10; // 50;
            boolean borderGap = true;
            int frames = 20;
            int phase = 7;
            for (int i = 0; i < wl; i++) {
                double d = (double) (period >> 1) * Math.sin((double) i / (double) period + (6.2831853071795862D * (double) phase) / (double)frames);
                g.copyArea(i, 0, 1, hl, 0, (int) d);
                if (borderGap) {
                    g.setColor(color);
                    g.drawLine(i, (int) d, i, 0);
                    g.drawLine(i, (int) d + hl, i, hl);
                }
            }
        }

        public void write (OutputStream sos) throws IOException {
            ImageIO.write(buffImg, "png", sos);
            sos.close();
        }

        public BufferedImage getBuffImg () {
            return buffImg;
        }

        public String getCode () {
            return code.toLowerCase();
        }
    }
